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Recording from a DAC produces a very different Spectrogram, could somebody explain why?

Hi

I took a wav file which is recorded as 44.1 KHz 32 bits float (A) and played it through a DAC (Topping NX4 DSD) which I recorded the output through an iD14 as 96KHz 32 bits float (B).

Then I opened the spectrogram view through Audacity of both to check the difference and B is full of stripes at regular interval. I wonder what could be the explanation.

Headphones output of guitar amp into Mixer input?

I have a Fender Champion 20 guitar amp and a Pyle Professional PAD43MXUBT mixer. This mixer doesn't have a HiZ guitar button on either of the channels. I haven't plugged the guitar into the channel and increased the gain to see if it gets enough signal. If it doesn't, can I take the headphones out from the amp and go into the mixer's line input on channel 1 or 2?

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